diff --git a/.reuse/dep5 b/.reuse/dep5
index 6f9bcc4..d2344cc 100644
--- a/.reuse/dep5
+++ b/.reuse/dep5
@@ -9,6 +9,6 @@ Source: https://github.com/fosslinux/live-bootstrap
 # Copyright: $YEAR $NAME <$CONTACT>
 # License: ...
 
-Files: SHA256SUMS.sources sysa/pre-sha.sha256sums sysa/*/checksums sysa/SHA256SUMS.pkgs
+Files: SHA256SUMS.sources sysa/pre-sha.sha256sums sysa/*/*.checksums sysa/SHA256SUMS.pkgs
 Copyright: none
 License: MIT
diff --git a/DEVEL.md b/DEVEL.md
index 87e4d2e..e1d575e 100644
--- a/DEVEL.md
+++ b/DEVEL.md
@@ -40,7 +40,7 @@ It then diverges based upon which driver is being used:
   There are default functions run which can be overridden by an optional script
   `package-version.sh` within the package-specific directory.
 
-In this folder, there are other folders/files. `src` and `checksums` are
+In this folder, there are other folders/files. `src` and `*.checksums` are
 required, others are optional.
 
 Permissable folders/files:
@@ -50,11 +50,8 @@ Permissable folders/files:
 - `patches`: patches for the source.
 - `src`: the upstream unmodified source code. This may be either a submodule or
   nonexistent.
-- `checksums`: the checksums for the resulting binaries and libraries that
-  are compiled and installed. This may be either a folder or a file. It should
-  be a folder when there are multiple checksumming files required (normally
-  multiple seperate passes) but a file when there is only one checksumming
-  file.
+- `*.checksums`: files containing the checksums for the resulting binaries and
+libraries that are compiled and installed.
   - Up to and including `patch`, `fletcher16` is used for the checksumming.
   - After `patch`, `sha-2` is built which contains an external implementation of
     `sha256sum`. We then use that currently for all remaining software.
diff --git a/sysa/after.kaem b/sysa/after.kaem
index 3a68934..c356bec 100755
--- a/sysa/after.kaem
+++ b/sysa/after.kaem
@@ -3,6 +3,7 @@
 # SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
 # SPDX-FileCopyrightText: 2021 Paul Dersey <pdersey@gmail.com>
 # SPDX-FileCopyrightText: 2020-2022 fosslinux <fosslinux@aussies.space>
+# SPDX-FileCopyrightText: 2022 Dor Askayo <dor.askayo@gmail.com>
 #
 # SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -17,123 +18,47 @@ prefix=/usr
 bindir=${prefix}/bin
 libdir=${prefix}/lib
 incdir=${prefix}/include
+srcdir=${prefix}/src
 TMPDIR=/tmp # tmpdir is needed for patch to work
 
-# Environmental variables needed for mes
-NYACC_PKG=nyacc-1.00.2
-MES_PKG=mes-0.24
-MES_PREFIX=${sysa}/${MES_PKG}/build/${MES_PKG}
-GUILE_LOAD_PATH=${MES_PREFIX}/mes/module:${MES_PREFIX}/module:${sysa}/${MES_PKG}/build/${NYACC_PKG}/module
-mkdir -p ${prefix} ${bindir} ${libdir} ${incdir} ${TMPDIR}
-cd ${prefix}
+mkdir -p ${prefix} ${bindir} ${libdir} ${incdir} ${srcdir} ${TMPDIR}
 
 # Remove remaining dependencies on /bin (stage0-posix directory)
-cp /${ARCH_DIR}/bin/blood-elf bin/blood-elf
-cp /${ARCH_DIR}/bin/catm bin/catm
-cp /${ARCH_DIR}/bin/chmod bin/chmod
-cp /${ARCH_DIR}/bin/get_machine bin/get_machine
-cp /${ARCH_DIR}/bin/hex2 bin/hex2
-cp /${ARCH_DIR}/bin/kaem bin/kaem
-cp /${ARCH_DIR}/bin/match bin/match
-cp /${ARCH_DIR}/bin/M1 bin/M1
-cp /${ARCH_DIR}/bin/M2-Planet bin/M2-Planet
-cp /${ARCH_DIR}/bin/mkdir bin/mkdir
-cp /${ARCH_DIR}/bin/sha256sum bin/sha256sum
-cp /${ARCH_DIR}/bin/ungz bin/ungz
-cp /${ARCH_DIR}/bin/untar bin/untar
-cp /${ARCH_DIR}/bin/cp bin/cp
+cp /${ARCH_DIR}/bin/blood-elf ${bindir}/blood-elf
+cp /${ARCH_DIR}/bin/catm ${bindir}/catm
+cp /${ARCH_DIR}/bin/chmod ${bindir}/chmod
+cp /${ARCH_DIR}/bin/get_machine ${bindir}/get_machine
+cp /${ARCH_DIR}/bin/hex2 ${bindir}/hex2
+cp /${ARCH_DIR}/bin/kaem ${bindir}/kaem
+cp /${ARCH_DIR}/bin/match ${bindir}/match
+cp /${ARCH_DIR}/bin/M1 ${bindir}/M1
+cp /${ARCH_DIR}/bin/M2-Planet ${bindir}/M2-Planet
+cp /${ARCH_DIR}/bin/mkdir ${bindir}/mkdir
+cp /${ARCH_DIR}/bin/sha256sum ${bindir}/sha256sum
+cp /${ARCH_DIR}/bin/ungz ${bindir}/ungz
+cp /${ARCH_DIR}/bin/untar ${bindir}/untar
+cp /${ARCH_DIR}/bin/cp ${bindir}/cp
 
-chmod 755 bin/blood-elf
-chmod 755 bin/catm
-chmod 755 bin/chmod
-chmod 755 bin/cp
-chmod 755 bin/get_machine
-chmod 755 bin/hex2
-chmod 755 bin/kaem
-chmod 755 bin/match
-chmod 755 bin/M1
-chmod 755 bin/M2-Planet
-chmod 755 bin/mkdir
-chmod 755 bin/sha256sum
-chmod 755 bin/ungz
-chmod 755 bin/untar
+chmod 755 ${bindir}/blood-elf
+chmod 755 ${bindir}/catm
+chmod 755 ${bindir}/chmod
+chmod 755 ${bindir}/cp
+chmod 755 ${bindir}/get_machine
+chmod 755 ${bindir}/hex2
+chmod 755 ${bindir}/kaem
+chmod 755 ${bindir}/match
+chmod 755 ${bindir}/M1
+chmod 755 ${bindir}/M2-Planet
+chmod 755 ${bindir}/mkdir
+chmod 755 ${bindir}/sha256sum
+chmod 755 ${bindir}/ungz
+chmod 755 ${bindir}/untar
 
 PATH=${bindir}
 
 cd ${sysa}
 
-# mes
-pkg=${MES_PKG}
-cd ${pkg}
-kaem --file ${pkg}.kaem
-cd ..
+catm run2.kaem bootstrap.cfg run.kaem
+chmod +x run2.kaem
 
-# tcc 0.9.26
-pkg="tcc-0.9.26"
-cd ${pkg}
-kaem --file ${pkg}.kaem
-cd ..
-
-libdir=${libdir}/mes
-
-# make
-pkg="make-3.80"
-cd ${pkg}
-kaem --file ${pkg}.kaem
-cd ..
-
-# gzip
-pkg="gzip-1.2.4"
-cd ${pkg}
-kaem --file ${pkg}.kaem
-cd ..
-
-# tar
-pkg="tar-1.12"
-cd ${pkg}
-kaem --file ${pkg}.kaem
-cd ..
-
-# sed
-pkg="sed-4.0.9"
-cd ${pkg}
-kaem --file ${pkg}.kaem
-cd ..
-
-# patch
-pkg="patch-2.5.9"
-cd ${pkg}
-kaem --file ${pkg}.kaem
-cd ..
-
-# bzip2
-pkg="bzip2-1.0.8"
-cd ${pkg}
-kaem --file ${pkg}.kaem
-cd ..
-
-# tcc 0.9.27
-pkg="tcc-0.9.27"
-cd ${pkg}
-kaem --file ${pkg}.kaem
-cd ..
-
-# coreutils
-pkg="coreutils-5.0"
-cd ${pkg}
-kaem --file ${pkg}.kaem
-cd ..
-
-# heirloom-devtools
-pkg="heirloom-devtools-070527"
-cd ${pkg}
-kaem --file ${pkg}.kaem
-cd ..
-
-# bash
-pkg="bash-2.05b"
-cd ${pkg}
-kaem --file ${pkg}.kaem
-cd ..
-
-exec bash run.sh
+kaem --file run2.kaem
diff --git a/sysa/bash-2.05b/checksums b/sysa/bash-2.05b/bash-2.05b.checksums
similarity index 100%
rename from sysa/bash-2.05b/checksums
rename to sysa/bash-2.05b/bash-2.05b.checksums
diff --git a/sysa/bash-2.05b/bash-2.05b.kaem b/sysa/bash-2.05b/bash-2.05b.kaem
index b6ac4eb..b883f9d 100755
--- a/sysa/bash-2.05b/bash-2.05b.kaem
+++ b/sysa/bash-2.05b/bash-2.05b.kaem
@@ -51,4 +51,11 @@ ln -s ${prefix}/bin/bash ${prefix}/bin/sh
 cd ../..
 
 # Checksums
-sha256sum -c checksums
+if match x${UPDATE_CHECKSUMS} xTrue; then
+    sha256sum -o ${pkg}.checksums \
+        /usr/bin/bash
+
+    install ${pkg}.checksums ${srcdir}
+else
+    sha256sum -c ${pkg}.checksums
+fi
diff --git a/sysa/bzip2-1.0.8/checksums b/sysa/bzip2-1.0.8/bzip2-1.0.8.checksums
similarity index 100%
rename from sysa/bzip2-1.0.8/checksums
rename to sysa/bzip2-1.0.8/bzip2-1.0.8.checksums
diff --git a/sysa/bzip2-1.0.8/bzip2-1.0.8.kaem b/sysa/bzip2-1.0.8/bzip2-1.0.8.kaem
index d2cfd70..ef295cc 100755
--- a/sysa/bzip2-1.0.8/bzip2-1.0.8.kaem
+++ b/sysa/bzip2-1.0.8/bzip2-1.0.8.kaem
@@ -35,4 +35,11 @@ bzip2 --help
 cd ../..
 
 # Checksums
-sha256sum -c checksums
+if match x${UPDATE_CHECKSUMS} xTrue; then
+    sha256sum -o ${pkg}.checksums \
+        /usr/bin/bzip2
+
+    cp ${pkg}.checksums ${srcdir}
+else
+    sha256sum -c ${pkg}.checksums
+fi
diff --git a/sysa/coreutils-5.0/checksums b/sysa/coreutils-5.0/coreutils-5.0.checksums
similarity index 100%
rename from sysa/coreutils-5.0/checksums
rename to sysa/coreutils-5.0/coreutils-5.0.checksums
diff --git a/sysa/coreutils-5.0/coreutils-5.0.kaem b/sysa/coreutils-5.0/coreutils-5.0.kaem
index ad71821..3550c76 100755
--- a/sysa/coreutils-5.0/coreutils-5.0.kaem
+++ b/sysa/coreutils-5.0/coreutils-5.0.kaem
@@ -38,4 +38,64 @@ cd ../..
 rm -r src/
 
 # Checksums
-sha256sum -c checksums
+if match x${UPDATE_CHECKSUMS} xTrue; then
+    sha256sum -o ${pkg}.checksums \
+        /usr/bin/install \
+        /usr/bin/basename \
+        /usr/bin/cat \
+        /usr/bin/chmod \
+        /usr/bin/cksum \
+        /usr/bin/cp \
+        /usr/bin/csplit \
+        /usr/bin/cut \
+        /usr/bin/echo \
+        /usr/bin/expand \
+        /usr/bin/factor \
+        /usr/bin/false \
+        /usr/bin/fmt \
+        /usr/bin/fold \
+        /usr/bin/head \
+        /usr/bin/id \
+        /usr/bin/join \
+        /usr/bin/kill \
+        /usr/bin/link \
+        /usr/bin/ln \
+        /usr/bin/logname \
+        /usr/bin/mkfifo \
+        /usr/bin/mkdir \
+        /usr/bin/mknod \
+        /usr/bin/nl \
+        /usr/bin/od \
+        /usr/bin/paste \
+        /usr/bin/pathchk \
+        /usr/bin/printf \
+        /usr/bin/ptx \
+        /usr/bin/pwd \
+        /usr/bin/readlink \
+        /usr/bin/rmdir \
+        /usr/bin/seq \
+        /usr/bin/sleep \
+        /usr/bin/split \
+        /usr/bin/sum \
+        /usr/bin/tail \
+        /usr/bin/tee \
+        /usr/bin/tr \
+        /usr/bin/tsort \
+        /usr/bin/unexpand \
+        /usr/bin/unlink \
+        /usr/bin/wc \
+        /usr/bin/whoami \
+        /usr/bin/test \
+        /usr/bin/touch \
+        /usr/bin/true \
+        /usr/bin/yes \
+        /usr/bin/ls \
+        /usr/bin/md5sum \
+        /usr/bin/mv \
+        /usr/bin/rm \
+        /usr/bin/sha1sum
+
+    install ${pkg}.checksums ${srcdir}
+else
+    sha256sum -c ${pkg}.checksums
+fi
diff --git a/sysa/gzip-1.2.4/checksums b/sysa/gzip-1.2.4/gzip-1.2.4.checksums
similarity index 100%
rename from sysa/gzip-1.2.4/checksums
rename to sysa/gzip-1.2.4/gzip-1.2.4.checksums
diff --git a/sysa/gzip-1.2.4/gzip-1.2.4.kaem b/sysa/gzip-1.2.4/gzip-1.2.4.kaem
index d5f0c00..adbb0ea 100755
--- a/sysa/gzip-1.2.4/gzip-1.2.4.kaem
+++ b/sysa/gzip-1.2.4/gzip-1.2.4.kaem
@@ -37,4 +37,11 @@ chmod 755 ${bindir}/gunzip
 cd ../..
 
 # Checksums
-sha256sum -c checksums
+if match x${UPDATE_CHECKSUMS} xTrue; then
+    sha256sum -o ${pkg}.checksums \
+        /usr/bin/gzip
+
+    cp ${pkg}.checksums ${srcdir}
+else
+    sha256sum -c ${pkg}.checksums
+fi
diff --git a/sysa/heirloom-devtools-070527/checksums b/sysa/heirloom-devtools-070527/heirloom-devtools-070527.checksums
similarity index 100%
rename from sysa/heirloom-devtools-070527/checksums
rename to sysa/heirloom-devtools-070527/heirloom-devtools-070527.checksums
diff --git a/sysa/heirloom-devtools-070527/heirloom-devtools-070527.kaem b/sysa/heirloom-devtools-070527/heirloom-devtools-070527.kaem
index 8605eae..1c7848e 100755
--- a/sysa/heirloom-devtools-070527/heirloom-devtools-070527.kaem
+++ b/sysa/heirloom-devtools-070527/heirloom-devtools-070527.kaem
@@ -44,4 +44,15 @@ install -m 644 ncform ${lexdir}
 cd ../../..
 
 # Checksums
-sha256sum -c checksums
+if match x${UPDATE_CHECKSUMS} xTrue; then
+    sha256sum -o ${pkg}.checksums \
+        /usr/bin/yacc \
+        /usr/bin/lex \
+        /usr/lib/mes/libl.a \
+        /yaccpar \
+        /lex/ncform
+
+    install ${pkg}.checksums ${srcdir}
+else
+    sha256sum -c ${pkg}.checksums
+fi
diff --git a/sysa/make-3.80/checksums b/sysa/make-3.80/make-3.80.checksums
similarity index 100%
rename from sysa/make-3.80/checksums
rename to sysa/make-3.80/make-3.80.checksums
diff --git a/sysa/make-3.80/make-3.80.kaem b/sysa/make-3.80/make-3.80.kaem
index 5f5dc1d..157660d 100755
--- a/sysa/make-3.80/make-3.80.kaem
+++ b/sysa/make-3.80/make-3.80.kaem
@@ -55,4 +55,11 @@ make --version
 cd ../..
 
 # Checksums
-sha256sum -c checksums
+if match x${UPDATE_CHECKSUMS} xTrue; then
+    sha256sum -o ${pkg}.checksums \
+        /usr/bin/make
+
+    cp ${pkg}.checksums ${srcdir}
+else
+    sha256sum -c ${pkg}.checksums
+fi
diff --git a/sysa/mes-0.24/checksums b/sysa/mes-0.24/mes-0.24.checksums
similarity index 100%
rename from sysa/mes-0.24/checksums
rename to sysa/mes-0.24/mes-0.24.checksums
diff --git a/sysa/mes-0.24/mes-0.24.kaem b/sysa/mes-0.24/mes-0.24.kaem
index ab72202..56953ef 100755
--- a/sysa/mes-0.24/mes-0.24.kaem
+++ b/sysa/mes-0.24/mes-0.24.kaem
@@ -314,6 +314,27 @@ cp include/sys/ucontext.h ${incdir}/sys/ucontext.h
 cp include/sys/user.h ${incdir}/sys/user.h
 cp include/sys/wait.h ${incdir}/sys/wait.h
 
-# Checksums
 cd ../..
-sha256sum -c checksums
+
+# Checksums
+if match x${UPDATE_CHECKSUMS} xTrue; then
+    sha256sum -o ${pkg}.checksums \
+        /usr/bin/mes \
+        /usr/bin/mes-m2 \
+        /usr/bin/mescc.scm \
+        /usr/lib/x86-mes/crt1.s \
+        /usr/lib/x86-mes/crt1.o \
+        /usr/lib/x86-mes/x86.M1 \
+        /usr/lib/x86-mes/libmescc.s \
+        /usr/lib/x86-mes/libc+tcc.s \
+        /usr/lib/x86-mes/libc.s \
+        /usr/lib/x86-mes/libmescc.a \
+        /usr/lib/x86-mes/libc+tcc.a \
+        /usr/lib/x86-mes/libc.a \
+        /usr/lib/linux/x86-mes/elf32-header.hex2 \
+        /usr/lib/linux/x86-mes/elf32-footer-single-main.hex2
+
+    cp ${pkg}.checksums ${srcdir}
+else
+    sha256sum -c ${pkg}.checksums
+fi
diff --git a/sysa/patch-2.5.9/checksums b/sysa/patch-2.5.9/patch-2.5.9.checksums
similarity index 100%
rename from sysa/patch-2.5.9/checksums
rename to sysa/patch-2.5.9/patch-2.5.9.checksums
diff --git a/sysa/patch-2.5.9/patch-2.5.9.kaem b/sysa/patch-2.5.9/patch-2.5.9.kaem
index 1094ff0..4653dd7 100755
--- a/sysa/patch-2.5.9/patch-2.5.9.kaem
+++ b/sysa/patch-2.5.9/patch-2.5.9.kaem
@@ -34,4 +34,11 @@ chmod 755 ${prefix}/bin/patch
 cd ../..
 
 # Checksums
-sha256sum -c checksums
+if match x${UPDATE_CHECKSUMS} xTrue; then
+    sha256sum -o ${pkg}.checksums \
+        /usr/bin/patch
+
+    cp ${pkg}.checksums ${srcdir}
+else
+    sha256sum -c ${pkg}.checksums
+fi
diff --git a/sysa/run.kaem b/sysa/run.kaem
new file mode 100755
index 0000000..78e528e
--- /dev/null
+++ b/sysa/run.kaem
@@ -0,0 +1,92 @@
+#!/bin/sh
+
+# SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
+# SPDX-FileCopyrightText: 2021 Paul Dersey <pdersey@gmail.com>
+# SPDX-FileCopyrightText: 2020-2022 fosslinux <fosslinux@aussies.space>
+# SPDX-FileCopyrightText: 2022 Dor Askayo <dor.askayo@gmail.com>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+set -ex
+
+# Environmental variables needed for mes
+NYACC_PKG=nyacc-1.00.2
+MES_PKG=mes-0.24
+MES_PREFIX=${sysa}/${MES_PKG}/build/${MES_PKG}
+GUILE_LOAD_PATH=${MES_PREFIX}/mes/module:${MES_PREFIX}/module:${sysa}/${MES_PKG}/build/${NYACC_PKG}/module
+
+# mes
+pkg=${MES_PKG}
+cd ${pkg}
+kaem --file ${pkg}.kaem
+cd ..
+
+# tcc 0.9.26
+pkg="tcc-0.9.26"
+cd ${pkg}
+kaem --file ${pkg}.kaem
+cd ..
+
+libdir=${libdir}/mes
+
+# make
+pkg="make-3.80"
+cd ${pkg}
+kaem --file ${pkg}.kaem
+cd ..
+
+# gzip
+pkg="gzip-1.2.4"
+cd ${pkg}
+kaem --file ${pkg}.kaem
+cd ..
+
+# tar
+pkg="tar-1.12"
+cd ${pkg}
+kaem --file ${pkg}.kaem
+cd ..
+
+# sed
+pkg="sed-4.0.9"
+cd ${pkg}
+kaem --file ${pkg}.kaem
+cd ..
+
+# patch
+pkg="patch-2.5.9"
+cd ${pkg}
+kaem --file ${pkg}.kaem
+cd ..
+
+# bzip2
+pkg="bzip2-1.0.8"
+cd ${pkg}
+kaem --file ${pkg}.kaem
+cd ..
+
+# tcc 0.9.27
+pkg="tcc-0.9.27"
+cd ${pkg}
+kaem --file ${pkg}.kaem
+cd ..
+
+# coreutils
+pkg="coreutils-5.0"
+cd ${pkg}
+kaem --file ${pkg}.kaem
+cd ..
+
+# heirloom-devtools
+pkg="heirloom-devtools-070527"
+cd ${pkg}
+kaem --file ${pkg}.kaem
+cd ..
+
+# bash
+pkg="bash-2.05b"
+cd ${pkg}
+kaem --file ${pkg}.kaem
+cd ..
+
+exec bash run.sh
diff --git a/sysa/run.sh b/sysa/run.sh
index 7b6a5ee..192ec61 100755
--- a/sysa/run.sh
+++ b/sysa/run.sh
@@ -16,19 +16,18 @@ export PREFIX="${prefix}"
 export SOURCES="${sysa}"
 export DISTFILES="${sysa}/distfiles"
 export DESTDIR=/tmp/destdir
-export REPO="${PREFIX}/src/repo"
+# shellcheck disable=SC2154
+export SRCDIR="${srcdir}"
 
 create_sysb() {
     # Copy everything in
     echo "Creating sysb rootfs"
     mkdir -p "/sysb${PREFIX}"
-    for d in bin include lib libexec share; do
+    for d in bin include lib libexec share src; do
         # Minimise RAM (storage) use - use hard links
         cp -rl "${PREFIX}/${d}" "/sysb${PREFIX}/${d}"
     done
-    mkdir /sysb/usr/src
-    cp "${SOURCES}/helpers.sh" "${SOURCES}/SHA256SUMS.pkgs" "${SOURCES}/bootstrap.cfg" /sysb/usr/src/
-    cp -rl "${REPO}" "/sysb/${REPO}"
+    cp "${SOURCES}/helpers.sh" "${SOURCES}/SHA256SUMS.pkgs" "${SOURCES}/bootstrap.cfg" "/sysb/${SRCDIR}"
     populate_device_nodes /sysb
     echo "Creating sysb initramfs"
     gen_initramfs_list.sh -o "${PREFIX}/boot/initramfs-sysb.cpio.gz" /sysb
@@ -101,7 +100,7 @@ echo "Thank you! All done."
 
 echo "ARCH=${ARCH}" >> "${SOURCES}/bootstrap.cfg"
 
-mkdir -p "${DESTDIR}" "${REPO}" /dev
+mkdir -p "${DESTDIR}" "${SRCDIR}/repo" /dev
 
 build flex-2.5.11
 
diff --git a/sysa/sed-4.0.9/checksums b/sysa/sed-4.0.9/sed-4.0.9.checksums
similarity index 100%
rename from sysa/sed-4.0.9/checksums
rename to sysa/sed-4.0.9/sed-4.0.9.checksums
diff --git a/sysa/sed-4.0.9/sed-4.0.9.kaem b/sysa/sed-4.0.9/sed-4.0.9.kaem
index a5ead71..4ba79d4 100755
--- a/sysa/sed-4.0.9/sed-4.0.9.kaem
+++ b/sysa/sed-4.0.9/sed-4.0.9.kaem
@@ -31,4 +31,11 @@ chmod 755 ${prefix}/bin/sed
 cd ../..
 
 # Checksums
-sha256sum -c checksums
+if match x${UPDATE_CHECKSUMS} xTrue; then
+    sha256sum -o ${pkg}.checksums \
+        /usr/bin/sed
+
+    cp ${pkg}.checksums ${srcdir}
+else
+    sha256sum -c ${pkg}.checksums
+fi
diff --git a/sysa/tar-1.12/checksums b/sysa/tar-1.12/tar-1.12.checksums
similarity index 100%
rename from sysa/tar-1.12/checksums
rename to sysa/tar-1.12/tar-1.12.checksums
diff --git a/sysa/tar-1.12/tar-1.12.kaem b/sysa/tar-1.12/tar-1.12.kaem
index 18535f3..527b25d 100755
--- a/sysa/tar-1.12/tar-1.12.kaem
+++ b/sysa/tar-1.12/tar-1.12.kaem
@@ -34,4 +34,11 @@ chmod 755 ${prefix}/bin/tar
 cd ../..
 
 # Checksums
-sha256sum -c checksums
+if match x${UPDATE_CHECKSUMS} xTrue; then
+    sha256sum -o ${pkg}.checksums \
+        /usr/bin/tar
+
+    cp ${pkg}.checksums ${srcdir}
+else
+    sha256sum -c ${pkg}.checksums
+fi
diff --git a/sysa/tcc-0.9.26/checksums b/sysa/tcc-0.9.26/tcc-0.9.26.checksums
similarity index 100%
rename from sysa/tcc-0.9.26/checksums
rename to sysa/tcc-0.9.26/tcc-0.9.26.checksums
diff --git a/sysa/tcc-0.9.26/tcc-0.9.26.kaem b/sysa/tcc-0.9.26/tcc-0.9.26.kaem
index 9975b1c..d08de00 100755
--- a/sysa/tcc-0.9.26/tcc-0.9.26.kaem
+++ b/sysa/tcc-0.9.26/tcc-0.9.26.kaem
@@ -388,4 +388,23 @@ tcc -ar cr ${libdir}/libgetopt.a getopt.o
 cd ../..
 
 # Checksums
-sha256sum -c checksums
+if match x${UPDATE_CHECKSUMS} xTrue; then
+    sha256sum -o ${pkg}.checksums \
+        /usr/bin/mes-tcc \
+        /usr/bin/boot0-tcc \
+        /usr/bin/boot1-tcc \
+        /usr/bin/boot2-tcc \
+        /usr/bin/boot3-tcc \
+        /usr/bin/boot4-tcc \
+        /usr/bin/tcc \
+        /usr/lib/mes/libc.a \
+        /usr/lib/mes/libgetopt.a \
+        /usr/lib/mes/crt1.o \
+        /usr/lib/mes/crti.o \
+        /usr/lib/mes/crtn.o \
+        /usr/lib/mes/tcc/libtcc1.a
+
+    cp ${pkg}.checksums ${srcdir}
+else
+    sha256sum -c ${pkg}.checksums
+fi
diff --git a/sysa/tcc-0.9.27/checksums b/sysa/tcc-0.9.27/tcc-0.9.27.checksums
similarity index 100%
rename from sysa/tcc-0.9.27/checksums
rename to sysa/tcc-0.9.27/tcc-0.9.27.checksums
diff --git a/sysa/tcc-0.9.27/tcc-0.9.27.kaem b/sysa/tcc-0.9.27/tcc-0.9.27.kaem
index 0955051..7c5dcc4 100755
--- a/sysa/tcc-0.9.27/tcc-0.9.27.kaem
+++ b/sysa/tcc-0.9.27/tcc-0.9.27.kaem
@@ -47,4 +47,11 @@ tcc -version
 cd ../..
 
 # Checksums
-sha256sum -c checksums
+if match x${UPDATE_CHECKSUMS} xTrue; then
+    sha256sum -o ${pkg}.checksums \
+        /usr/bin/tcc
+
+    cp ${pkg}.checksums ${srcdir}
+else
+    sha256sum -c ${pkg}.checksums
+fi